Davis Strait Paleocene picrites: Products of a plume or plates?

2020 ◽  
Vol 206 ◽  
pp. 102770 ◽  
Author(s):  
D. Barrie Clarke ◽  
Erin K. Beutel
Keyword(s):  
Davis Strait

Trends and variability of sea ice in Baffin Bay and Davis Strait, 1953–2001

2003 ◽  
Vol 22 (1) ◽  
pp. 11-18 ◽  
Author(s):  
Harry L. Stern ◽  
Mads Peter Heide-Jørgensen
Keyword(s):  
Sea Ice ◽  
Baffin Bay ◽  
Davis Strait

Population ecology of polar bears in Davis Strait, Canada and Greenland

2013 ◽  
Vol 77 (3) ◽  
pp. 463-476 ◽  
Author(s):  
Elizabeth Peacock ◽  
Mitchell K. Taylor ◽  
Jeffrey Laake ◽  
Ian Stirling
Keyword(s):  
Population Ecology ◽  
Polar Bears ◽  
Davis Strait

Early Tertiary basalts from the Labrador Sea floor and Davis Strait region

1989 ◽  
Vol 26 (5) ◽  
pp. 956-968 ◽  
Author(s):  
D. B. Clarke ◽  
B. I. Cameron ◽  
G. K. Muecke ◽  
J. L. Bates
Keyword(s):  
Volcanic Rocks ◽  
Labrador Sea ◽  
Baffin Island ◽  
Nd Isotope ◽  
Sea Floor ◽  
West Greenland ◽  
Depleted Mantle ◽  
Davis Strait ◽  
Isotope Systematics ◽  
Seawater Exchange

Fine- to medium-grained, phyric and aphyric basalt samples from ODP Leg 105, site 647A, in the Labrador Sea show little evidence of alteration. Chemically, these rocks are low-potassium (0.01–0.09 wt.% K2O), olivine- to quartz-normative tholeiites that compare closely with the very depleted terrestrial Paleocene volcanic rocks in the Davis Strait region of Baffin Island and West Greenland. However, differences exist in the Sr–Nd isotope systematics of the two suites; the Labrador Sea samples have ε Nd values (+9.3) indicative of a more depleted source, and are higher in 87Sr/86Sr (0.7040), relative to the Davis Strait basalts (ε Nd +2.54 to +8.97; mean 87Sr/86Sr 0.7034). The higher 87Sr/86Sr in the Labrador Sea samples may reflect seawater exchange despite no petrographic evidence for significant alteration. The Labrador Sea and early Davis Strait basalts may have been derived from a similar depleted mantle source composition; however, the later Davis Strait magmas were generated from a different mantle. None of the Baffin Island, West Greenland, or Labrador Sea samples show unequivocal geochemical evidence for contamination with continental crust.

scholarly journals XXIV. Preliminary report of the biological results of a cruisc in H. M. S. 'Valorous’ to Davis Strait in 1875

1877 ◽  
Vol 25 (171-178) ◽  
pp. 177-230 ◽  
Keyword(s):  
Deep Sea ◽  
Royal Society ◽  
Preliminary Report ◽  
Scientific Exploration ◽  
Davis Strait ◽  
The Government ◽  
Scientific Results ◽  
North Polar

On this occasion I propose to adopt the same course that was taken in presenting to the Royal Society the Preliminary Report of the scientific exploration of the deep sea in H. M. Surveying-vessel ‘Porcupine’ in the years 1869 and 1870, in both of which expeditions I took a part. Narrative. 1. The Government having, at the instance of the Society and other scientific bodies, determined to equip and send out last year two ships (the ‘Alert’ and ‘Discovery’) on a North-Polar Expedition, and with these vessels the ‘Valorous’ frigate as a store-ship to accompany them as far as Disco in Davis Strait, it was considered desirable to make the last-named vessel available for sounding and dredging on her return voyage. Accordingly the following correspondence with the Admiralty took place, and will serve to explain the circumstances under which the scientific results now about to be noticed were obtained.

scholarly journals Full-fit reconstruction of the Labrador Sea and Baffin Bay

2013 ◽  
Vol 5 (2) ◽  
pp. 917-962 ◽  
Author(s):  
M. Hosseinpour ◽  
R. D. Müller ◽  
S. E. Williams ◽  
J. M. Whittaker
Keyword(s):  
North America ◽  
Continental Crust ◽  
Seafloor Spreading ◽  
Labrador Sea ◽  
Gravity Inversion ◽  
Seismic Profiles ◽  
Baffin Bay ◽  
Davis Strait ◽  
Break Up ◽  
Magnetic Lineations

Abstract. Reconstructing the opening of the Labrador Sea and Baffin Bay between Greenland and North America remains controversial. Recent seismic data suggest that magnetic lineations along the margins of the Labrador Sea, originally interpreted as seafloor spreading anomalies, may lie within the crust of the continent–ocean transition. These data also suggest a more seaward extent of continental crust within the Greenland margin near the Davis Strait than assumed in previous full-fit reconstructions. Our study focuses on reconstructing the full-fit configuration of Greenland and North America using an approach that considers continental deformation in a quantitative manner. We use gravity inversion to map crustal thickness across the conjugate margins, and assimilate observations from available seismic profiles and potential field data to constrain the likely extent of different crustal types. We derive end-member continental margin restorations following alternative interpretations of published seismic profiles. The boundaries between continental and oceanic crust (COB) are restored to their pre-stretching locations along small circle motion paths across the region of Cretaceous extension. Restored COBs are fitted quantitatively to compute alternative total-fit reconstructions. A preferred full-fit model is chosen based on the strongest compatibility with geological and geophysical data. Our preferred model suggests that (i) the COB lies oceanward of magnetic lineations interpreted as magnetic anomaly 31 (70 Ma) in the Labrador Sea, (ii) all previously identified magnetic lineations landward of anomaly 27 reflect intrusions into continental crust, and (iii) the Ungava fault zone in Davis Strait acted as a leaky transform fault during rifting. This robust plate reconstruction reduces gaps and overlaps in the Davis Strait and suggests that there is no need for alternative models proposed for reconstructions of this area including additional plate boundaries in North America or Greenland. Our favored model implies that break up and formation of continent–ocean transition (COT) first started in the southern Labrador Sea and Davis Strait around 88 Ma and then propagated north and southwards up to onset of real seafloor spreading at 63 Ma in the Labrador Sea. In the Baffin Bay, continental stretching lasted longer and actual break up and seafloor spreading started around 61 Ma (Chron 26).

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